Flux guide type device, head having the same, and drive

A method for manufacturing a flux guide type device including a magnetoresistive device for reading a signal flux, and a flux guide for transmitting the signal flux to the magnetoresistive device, said method comprising the steps of:

• forming a laminated film for the magnetoresistive device on a substrate;
• etching down to the substrate by using resist partially formed on the laminated film;
• forming an insulating layer on an entire surface of the substrate and the laminated film that has been etched;
• forming the flux guide that includes a ferromagnetic layer, a non-magnetic metal layer and a ferromagnetic layer in this order, on the substrate and the laminated film, on which the insulating layer has been formed;
• and
• peeling off the resist and a layer on the resist.

A method for manufacturing a flux guide type device including a magnetoresistive device for reading a signal flux, and a flux guide for transmitting the signal flux to the magnetoresistive device, the magnetoresistive device including a first ferromagnetic layer with a substantially fixed direction of magnetization, and a second ferromagnetic layer with a freely variable direction of magnetization to an external magnetic field, said method comprising the steps of:

• forming, on a substrate, the flux guide that includes a ferromagnetic layer, a non-magnetic metal layer and a ferromagnetic layer in this order;
• forming a laminated film that constitutes the magnetoresistive device on the flux guide;
• partially forming resist on the laminated film and etching the first and second ferromagnetic layers;
• and
• peeling off the resist.

A method for manufacturing a flux guide type device including a magnetoresistive device for reading a signal flux, and a flux guide for transmitting the signal flux to the magnetoresistive device, the magnetoresistive device including a first ferromagnetic layer with a substantially fixed direction of magnetization, and a second ferromagnetic layer with a freely variable direction of magnetization to an external magnetic field, said method comprising the steps of:

• forming, on a substrate, which constitute the flux guide and the second ferromagnetic layer that includes (a ferromagnetic layer, a non-magnetic metal layer and a ferromagnetic layer in this order);
• forming a laminated film that constitutes the magnetoresistive device except the second ferromagnetic layer after said forming step;
• partially forming resist on the laminated film and partially etching the laminated film;
• and
• peeling off the resist.

A read head comprising:

• a flux guide type device that includes a magnetoresistive device for reading a signal flux, and a flux guide for transmitting the signal flux to the magnetoresistive device, wherein said flux guide includes a laminated film that includes a ferromagnetic layer, a non-magnetic layer and a ferromagnetic layer in this order, and the two ferromagnetic layers in said flux guide have antiparallel directions of magnetization with respect to the non-magnetic layer;
• a part for supplying sense current to the magnetoresistive device;
• and
• a part for reading a signal based on a change in electric resistance of the magnetoresistive device that changes in accordance with the signal flux.

A drive comprising:

• a head part including a read head and a write head;
• and
• a drive part for driving a magnetic record carrier recorded and reproduced by said head part,
• wherein the read head includes:
• a flux guide type device that includes a magnetoresistive device for reading a signal flux, and a flux guide for transmitting the signal flux to the magnetoresistive device, wherein said flux guide includes a laminated film that includes a ferromagnetic layer, a non-magnetic layer and a ferromagnetic layer in this order, and the two ferromagnetic layers in said flux guide have antiparallel directions of magnetization with respect to the non-magnetic layer,
• a part for supplying sense current to the magnetoresistive device;
• and
• a part for reading a signal based on a change in electric resistance of the magnetoresistive device that changes in accordance with the signal flux;